Folic acid is a B vitamin. It is used in our bodies to make new cells. The CDC and the U.S. Public Health Service have determined that 400mcg is the recommended daily value. Folic acid is the synthetic form of the vitamin that is used in supplements and fortified foods.
Folate is another form of the B vitamin folic acid that occurs naturally in foods such as beans, peanuts and other legumes, avocados, leafy green vegetables and orange juice. It isn't necessary to drastically reduce foods naturally high in folates. Especially if one is avoiding processed foods that are supplemented with folic acid. Please see:
Folic acid supplementation is only recommended for women of child-bearing age who may become pregnant to ensure that they receive the recommended daily value and prevent birth defects.
Because folic acid is turned by the body into DHFR (DiHydro-Folate Reductase) which can be used by parasitic bacteria to form the nucleic acids which are at the basis of bacterial survival and reproductive cycles, excess folic acid can be detrimental to patients with Th1 inflammatory diseases.
Most people get enough folic acid by eating a normal diet. It is advisable for people with Th1 inflammation to avoid folic acid supplementation. Folic acid is commonly added to multivitamins and processed grain products such as white flour, white bread, cereal and baked goods.